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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd22ae2cd4fc6f1ff995e801e41784ce3822dd12aaea506c33b9eda3405ef77e6' 
  AND token = 'rEyUAYHyR6B+r+dyxtfg+3m799yk/ewVx/r7PWqxtg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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