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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3f2061d0b0b5dc03987c1f27e0cbf4502739649d30604e0cff25a3ce06303f' 
  AND token = 'bFIOAqzd8TJnU8d9U1JtUV+ueiyDO44SLbHeX287WgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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