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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b86ab955f9b2ec0a7f88e6c263b4f0f019fadb6a9e196f5528104f7a3870e9' 
  AND token = 'x3ivtO7s3SWS3W7OTWSAryqrLDxfIeMCFVfbsrIttRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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