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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97806fc077e9c495c1d7b86103ca817f8d5163a2ce238f959911bf4a31065585' 
  AND token = 'QW6LgrMw22qaBO5PUgmyIAwSIBZxPDsqG1a25nmKvxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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