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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76478ca5327aa3b0d17689c5f6acbe38744a9eae82c6b157ea07424a6756e0ce' 
  AND token = 'HfsN6rhqC1dBdxgHPOzC6ua7MAjrtz5xNCrLK2oUb6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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