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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960ebd335a1e14ad6490abff927013f6e00ec97007c144aa1ea3be820ac935ca' 
  AND token = 'wW9lRgO4eRXvjEuPAW3+HPU8ohJd9MrBKX72T+nOgSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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