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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7f1383aca716def49157d1f79d93aaab603eec4002aa581c543736663bdd95' 
  AND token = 'wotOniz7PhCtPoquTd5Pm239WGB6S83l3OLLqSsDPmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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