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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370cdce52bf09ee476caed0757fad9dca3290499c36fa0376a14375d8076bac5' 
  AND token = 'UkwyYx5A0/iz0PDl/jy+pjkfAzH2DTp5qKM+v+SHo1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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