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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd605fde2a8f51135cfe8c455d4dcbd60e82e798f18fa24db2c38b301e348e97' 
  AND token = '3tvdya3LlTHBHR43ev6oR3Nc9egJMfqIqJIrUOyp5nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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