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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139f1aadc8b5e1d7c71d273697a90d3ebf0cc602c90f1be65333ea38cabc64d7' 
  AND token = 'Ch4EHWHFua4iOxwfWRG6bWFcLicSqqZWx73tCK1o5H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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