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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3721b6aae72209f4126a85cc9a3143e316a22e25941b75b431034703e84ca510' 
  AND token = 'G99vxea6yyCK52UW0x+tpemgMSduZjbwmZ9s0xanVjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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