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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027ee4582d75ea236e499ad39aca4c199af7357c9b2c910501167e1a652bbb4' 
  AND token = 'O9xAmFd68cOKsXc7gjz+g5X2bVjZv08yrv6n34t29to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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