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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292b49bc7fdc15044fb9bffc2a101cf239c8f05249aad5c44b98257aa2ac60cd' 
  AND token = 'Vk8MrXuGANkZv68UFjPt1Vf2CwB24oq45x07utNyocQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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