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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef34ca396d86813cf2e97235e54efb6d700f36134566be6a4bb4d6cf90ad5dbc' 
  AND token = 'Pekc2AlkaE6Noy0w6m2gpbiqCZB0j1qwwla85hQrLOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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