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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef733600c36f0baab4a214b76250d82df690af6e72af0c4ae0ee812689d9a81' 
  AND token = 'dT21f55CWYEwvrJGUP3hwq6RcmCmbOTz5wEOxOqVo3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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