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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd260cb72689eed2371dd7873fc6a06bba38dfba8797416c8cbe07979203a810' 
  AND token = '8nW7btIqde9Cqloq4royeP4cMQgyrO5Kyi/zG4pIPnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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