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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d148847a6fa6ff9f9efb78ee82e7cf761245f2689e0e0244cc91f6b2f4dc7f' 
  AND token = 'ssmHUgqazGM6DIWtxnd/AY9FRc7OXehfVC1eTjuLx5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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