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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28d4b0810183198637c83d50e2d6dd7d1ae7a5fb8d855b28b0243b20ffc8eb6' 
  AND token = 'nkMfCHkBEQhzs8u0NpVoZWiuNvKtekRffa5+yWIab5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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