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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe982638c301ed68c8a7a585d8d93a9bc6bd699d477429732016d88898f2bec7' 
  AND token = 'YtpS0A22NzE1hsR3hJkYy1LWcUYpPOwYrpL47WOBOu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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