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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884d039ecb3fa9ffbe2d0bfba2671a60e51a59ae538101b4388f618c28f38a93' 
  AND token = '+bQjHV0rSvTtc91Vnnnmym98wmqjWf3YfX5ss5wBhhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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