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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bce51fe8a09347e730a7e9c535f099c8e4f5c6f035c19f8c74a6a0e6f3dadec' 
  AND token = 'oNj5ahbXE/Q5FNf+DjTb+13pQdJCBQfWylWz6Cikuas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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