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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb40ab6af1c586253f18539530b2d7538c2d44bf761ad1df01fc05d4a5695dc' 
  AND token = 'mB3vHuZIWBNuLsffwRgrIqm738bung7bVnCdzr3tyHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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