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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2b328453e35b4911c86dec98472b340765ae491860456eb458b4e3573aac7c' 
  AND token = '9jeL6rJTHxBuHYjsoJ46brEYmMKqg/a52qxnAibi60c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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