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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5b39fb164f104a06f0d4efaab71bbcecd0a938e4ffba0eecbc9ce72ae36593' 
  AND token = '3AcX5y/96fpylUFNQU/w0XOV9Uhgi59K2CUl8UFrrsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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