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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347330eb7b6209aaf61ac4891801c1e35add75e4915745223947aa974126b212' 
  AND token = 'CL6zNe2R3Ff7X0dWIt1NmsuMhJEKA/IdrvgXPRWcYpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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