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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55b0b29d73696917516bae781b46bb21519b48239ff707bff2c9ba40c090b9a' 
  AND token = '9C0EZ/jAqaelYUfcDkWbjMZiG0brc4qSj0kd5KUf0to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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