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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afff35954e2baad008b9a7f28b94f7cb1f81498cb9791e5ab99ad29ed64b097' 
  AND token = 'Liwyte5WZIjkRr1lKJeT0Ghsg4+5ax3T4hCneRrQp5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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