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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063ea2d0baf0279c7136a04b5d109aa5857c219dbad7b964c5b00f5d98779916' 
  AND token = '6vDaLs15eDwh5o6lmGFwuzDmEr3MbReIyG3sztvVOR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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