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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080f4b377849e75a5c1c740a2fb15061155d4b4ab2dc5eaf75912d088104bf96' 
  AND token = '5TaBv9j+2W5VwR0iTstJkOmU+E3g0XUj+AFD8yKnVds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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