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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f8540f1a5d5e3a8b14dd18255f7033487832ca83d68cef87815d81ce587a22' 
  AND token = '7Th8l+welq3kNQY55jLAV+F8qSeDl7VrwA4ndxKW+xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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