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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffada6c9f8b7e1a6229e437202fdcf5de63e4e8c1e399f4f9d014da75771327' 
  AND token = 'Fe9t3tjKJKULI+3c1BK1rPFFrjB/oLmiORJPgA+423M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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