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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb3af04faf36b1e9aef675f696d4ab19a8f1f7b507fb94b8200db48713e80a2' 
  AND token = 'T9adZycKSrNsx51xOjk0t/GlhAJJDlm3aMeZmRPg4Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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