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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fdbb6a59bde67512dc1b75b8e5f557ac4484425cbf746a660670ed8e7ee26b' 
  AND token = 'OAFIoEAfSLSsdxK8Psi6FgPcmaUSr+zx1++/hdaomXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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