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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a064a26d84f4d91f34d85a1015c45617216d6c17cdf2e61a237787aabd4895b' 
  AND token = 'FcOaApcJ1p5KNGdYxmbUSTcG6b2KiIqpsbf4DZ+YzaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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