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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7289162bdaf251ff54641046809b8c92adb560bf7bffea43bccd4e2ded08db46' 
  AND token = 'Wx1Q+2CuCuMxv8eVwzGSb8VTxl6+O5LYIzAdkCSgd1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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