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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4029f771ce15cf4c7b4e2b0112078c660e602a07026f67ecbd07a691870f16' 
  AND token = 'O+hVwQfF4YcK3hM57eLqzObdTFAtdv45D0BuFbi/KXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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