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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c9343e7d776b773a756c24d121f7693d30147f41d678597566f134d8a32da9' 
  AND token = 'ddicFGra9StBRafQs9JHbHw0Zc+EuZ/RNlKlPWS+4o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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