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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1826f6ffe3254355a39b69553d49115f51fec6abcea897f7c3165733d95fb49' 
  AND token = 'YcbJFK/boZCKcaYlrDnpGFNKNPcTxZv6PeifkFBM9dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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