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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93ea6cf3361489db12695ed6b6bbad1c75bf35979a5e9d4b495b0d5faaaec50' 
  AND token = 'dXzWJko8fXtNzvm/CvF8fYUAxOJy9MQnaIqqiyvIuxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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