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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40647135dacbf93acc2de805df89d2f7223234a1f90adee4bf2c0d2463126d6f' 
  AND token = 'j4VBRxBCt3ymA/vfr7d60fSpFA2be/c72ZFKaORDkVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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