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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547cb68c715e71c0ce2dabf8efec228d4bae016fb0e0324aa97d4cf0a02b257d' 
  AND token = '/uWdTXQwIfhdk34XlkvBv0Bq44LYarb+wCXrWrnrifU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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