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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12fa6cae7cb7eaa257edb70ac93786e8453f79a2c57630f4393014a37069e20' 
  AND token = '/Mi/En0rCNazUB0JdOorlGxGKe/YY3UpzCgwJvdSlHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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