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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdbe8e5d6d5ecdeadafe8a244b69d12b07028d6b941615f8af0bfeb02ff64e9' 
  AND token = 'jqiW0mR0wc6d7Ak2szzYWNDkFXTxX5VOWrkhDuRmu0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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