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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb72e96c535702ee65ff4423bb79ef14526a7d5814294e353d32d333aae908c0' 
  AND token = 'a5FW+7X5XeXKaBArfSG+t1AdadWSX6Vn5TGWjbJW8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}