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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596231d556e56882d6dd5a74233556e71c7f37881fba9583a60fcacc77932eb5' 
  AND token = 'Tmspn8cDuVz5iydyYOJy1kaDsVfdQr9NU+8rL/X98GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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