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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fccb7a7bdef696e6c630bbe8a77a3b830e6880d2dce97faf5bf996e9266e8c' 
  AND token = 'MrA7zCVpQ5E6lpIab7Uv1WfI3+IPTcXAyvqGiv5BnvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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