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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f602ecb2eec6bf7b3057307ec3656f0b68527f93e9ce80cb5c80d5a7c88e2aca' 
  AND token = 'JKDh9XL4rgwYGxT2JKpHR6M+RMAPVFJHz+yTAQaWeXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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