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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9aeda1c3c9ac71546d4f18cc8b98fd9beeac9c295f3a400988cf01f6fcc18a' 
  AND token = '2ST/vIhu9Lezm1pf5aba1aRJa8pq3o3MC6Jxt39GVog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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