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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a34f38ca38105b1bcc994de70127cb37e7746bb76620f8339b98fdb0e760dd9' 
  AND token = '2SaB0DNoKLvjpH3HdxeVXaYQ4vRxtvDTtpJuipeFCDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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