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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d773c5a1754efe6dec553c1f766618bfed1e683c0776c1cac69f26d2ce6273' 
  AND token = '7VS5w27/a3NMrbPXLFhVgCHJmUOS/rhWEf8IzcAtgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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