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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bc8d6e9b2ccf917e0f4a1946359b0833bca8e5cb7b8e969cfb8d20aaeac0ae' 
  AND token = 'mhIGRTWALph9WV2t79A01M0/EwU2RpsEyQczJGIjWno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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