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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565a6ff4b37d1d6ef204aa8a594dede1b35d6864ce34e5497cdc3207fcd2d60c' 
  AND token = '/xaMOH5bgJKNvOfTO42L3wjjNncndZaljfHhh+7w+QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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