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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6e7789de8bb4219669a3a845f561e41b6371f6ea9d7eecde50d7bdb8e6e157' 
  AND token = 'pG1oojImPyroTFAYICdh+0xgnitBMWsok1x7ra013+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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