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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7953f8ed3584c2b47fba0e45b2c88326cdc17dfe9fea3ace2d5fea70faf7ea' 
  AND token = 'DWe2p19tw6ug3YVMSHn6icj0iUS2BTud/jySj3A8nVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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