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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d9acbeba8788c52bb6fb5e2d097a2f69bf9e4262b9feed3816de2830a64b3f' 
  AND token = 'hEjYT+h+5G2whZxE/zZhixf28ZNQDvaqpXLbEmeBKWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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