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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629f3e5f1e2db4d9fe10cd67e1dc058792d5b34a11260ed25c42b69c475ddb10' 
  AND token = 'Ti7iTDzrPysyAbNgoKfXeXEfc4moanhnayxG/N7ngEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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