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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4d069c4bf9c25f42ae5a422f09201e2e00eecea56aab40c8d5000ab8dd086a' 
  AND token = 'tndI3cK8pI93zIgZhPQimpcVWn8RKGvVMxTh/4fTy2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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