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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e72f287883e816d0dbc034ccb41088b9a8556d717c9223949d554cff6c8d278' 
  AND token = 'H2TpIJG4CAQKiHkD70A09SKWz2hNZuYlRFOmVlO38V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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