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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d048d863858c74b26d6312f723ec8ec822a9004518a47c8055bf6e5d614cd22' 
  AND token = '7ABp+Ee0xZTgklUJBwg4ZTg3DO7oomAe16sewFq70mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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