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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811dc5859807c906e9a3a3032b6a6c82a2e2cb134045543d1e0d4c5408e54c3b' 
  AND token = '1jkXoUeVC5FbvHaSiKLdHuqG0mrw3yjij7glGxcGDnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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