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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bf4fd7b286e5e262ba01332e0a527b564a7d90e38bc5ddc5a36902d569aa9a' 
  AND token = 'a2WhSYz1Jt9x8nfylqqZ16lD/SzXrXzch4YAAZp1CtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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